#include<bits/stdc++.h>

using namespace std;
using ll = long long;
#define endl '\n'
const int maxn = 2e6 + 100;
ll a[maxn], dp[maxn];

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    int a[] = {1, 3, 5, 7, 9, 2, 4, 6, 8, 0};
    int k = 2;
    cout << find(a, a + 10, 2) - a << endl;
    return 0;
}
